CTS Display Technologies and Video Systems 5 — Questions and Answers
Question 1: Which video synchronization method embeds sync information within the luminance signal itself, eliminating the need for separate sync lines?
- Separate sync (VGA-style)
- Composite sync
- Sync-on-green (SOG) (Correct answer)
- Bi-level sync
Correct answer: Sync-on-green (SOG)
Sync-on-green (SOG) embeds the horizontal and vertical sync pulses onto the green channel of an RGB signal, requiring no dedicated sync wire.
Question 2: A CTS candidate is evaluating ambient light for a display installation. The room measures 150 lux at the screen surface. Using the recommended screen luminance-to-ambient ratio guideline, what minimum screen luminance (in nits) should the display produce?
- 150 nits
- 300 nits
- 450 nits (Correct answer)
- 50 nits
Correct answer: 450 nits
A 3:1 screen luminance to ambient illuminance ratio is commonly recommended; 150 lux × 3 = 450 nits minimum screen luminance for adequate contrast.
Question 3: What is the primary advantage of using DisplayPort Multi-Stream Transport (MST) in a professional AV installation?
- It increases single-display resolution beyond 8K
- It allows multiple independent displays to be daisy-chained from a single DisplayPort output (Correct answer)
- It converts DisplayPort to HDMI natively
- It provides Power over DisplayPort for displays
Correct answer: It allows multiple independent displays to be daisy-chained from a single DisplayPort output
DisplayPort MST allows multiple independent video streams to be transmitted over a single cable and daisy-chained through compatible displays or hubs.
Question 4: A technician is aligning a dual-projector edge-blend system. After geometry correction, there is still a visible bright seam at the overlap zone. What should be adjusted next?
- Increase the projector lamp output on both units
- Apply gamma correction to the overlap zone using the blend overlap width and falloff curve settings (Correct answer)
- Reduce the screen gain in the overlap area
- Adjust the color temperature independently on each projector
Correct answer: Apply gamma correction to the overlap zone using the blend overlap width and falloff curve settings
The bright seam in an edge-blend overlap zone is corrected by adjusting the blend width and the luminance falloff curve so that the two projectors' contributions sum to uniform brightness.
Question 5: Which VESA display standard defines the mounting hole pattern commonly used for professional flat-panel displays up to 800×400mm spacing?
- VESA FPMPMI (Flat Panel Monitor Physical Mounting Interface) (Correct answer)
- VESA DisplayHDR
- VESA Adaptive Sync
- VESA DSC (Display Stream Compression)
Correct answer: VESA FPMPMI (Flat Panel Monitor Physical Mounting Interface)
The VESA FPMPMI standard defines the standardized mounting hole patterns (e.g., 75×75, 100×100, up to 800×400mm) used for flat-panel display mounting.
Question 6: A client wants to display different content zones on a single large LED videowall simultaneously. Which technology enables independent content regions on one display surface?
- Daisy-chain signal routing
- Video wall processor with multi-window/zone capability (Correct answer)
- EDID management software
- Color calibration hardware
Correct answer: Video wall processor with multi-window/zone capability
A video wall processor with multi-window capability can accept multiple independent video inputs and assign each to specific zones or regions across the display surface.
Question 7: When specifying an LCD display for a 24/7 digital signage deployment, which panel rating should be prioritized over consumer-grade specifications?
- Higher native contrast ratio
- Commercial-grade with rated MTBF and continuous-duty hours specification (Correct answer)
- Wider color gamut coverage
- Higher peak brightness for HDR gaming
Correct answer: Commercial-grade with rated MTBF and continuous-duty hours specification
Commercial-grade displays are engineered and rated for continuous 24/7 operation with specified MTBF (Mean Time Between Failures), unlike consumer panels rated for 8-12 hours daily use.
CTS Display Technologies and Video Systems 5
Which video synchronization method embeds sync information within the luminance signal itself, eliminating the need for separate sync lines?